W. Gao et Ml. Wesely, MODELING GASEOUS DRY DEPOSITION OVER REGIONAL SCALES WITH SATELLITE-OBSERVATIONS .1. MODEL DEVELOPMENT, Atmospheric environment, 29(6), 1995, pp. 727-737
Surface spectral reflectances remotely sensed by environmental satelli
tes were used to improve parametrization of surface process in modelin
g dry deposition over large geographic regions. A coupled reflectance-
resistance model was developed for deriving canopy parameters such as
leaf area index (LAI) from spectral radiances reflected from a canopy-
soil system and for estimating canopy conductances that control pollut
ant transfer to various sinks inside a plant canopy. The new model was
tested with local-scale measurements of ozone dry deposition to a tal
lgrass prairie along with remote sensing data from SPOT 1 and Landsat
5 extracted for the field measurement site. The model driven by satell
ite observations closely described both seasonal and short-term change
s in canopy total green LAI. Ozone canopy stomatal conductances and dr
y deposition velocities modeled with satellite-derived LAI agreed with
measurements with root mean square differences of 0.12 and 0.11 cm s-
1, respectively.